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XR16C2450 fiches techniques PDF

Exar Corporation - 2.97V TO 5.5V DUART

Numéro de référence XR16C2450
Description 2.97V TO 5.5V DUART
Fabricant Exar Corporation 
Logo Exar Corporation 





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XR16C2450 fiche technique
xrwww.DataSheet4U.com
DECEMBER 2004
GENERAL DESCRIPTION
The XR16C2450 (2450) is a dual universal asynchro-
nous receiver and transmitter (UART). The
XR16C2450 is an improved version of the
XR16C2450 with lower operating voltage and 5 volt
tolerant inputs. The 2450 provides enhanced UART
functions, a modem control interface and data rates
up to 1.5 Mbps. Onboard status registers provide the
user with error indications and operational status. In-
dependent programmable baud rate generators are
provided to select transmit and receive clock rates up
to 1.5 Mbps. An internal loopback capability allows
onboard diagnostics. The 2450 is available in a 44-
pin PLCC and 48-pin TQFP packages. The 2450 is
fabricated in an advanced CMOS process capable of
operating from 2.97 volt to 5.5 volt power supply with
5 volt tolerant inputs.
APPLICATIONS
Portable Appliances
Telecommunication Network Routers
Ethernet Network Routers
Cellular Data Devices
Factory Automation and Process Controls
XR16C2450
2.97V TO 5.5V DUART
FEATURES
REV. 1.0.0
2.97 to 5.5 Volt Operation
5 Volt Tolerant Inputs
Pin-to-pin compatible to Exar’s XR16C2450,
ST16C2550, XR16L2550, XR16L2750 and
XR16C2850
Pin-to-pin compatible to TI’s TL16C752B on the 48-
TQFP package
2 independent UART channels
Up to 1.5 Mbps data rate with a 24 MHz crystal
oscillator or external clock frequency
1 byte Transmit FIFO
1 byte Receive FIFO with error tags
Status report registers
Modem control signals (CTS#, RTS#, DSR#,
DTR#, RI#, CD#)
Programmable character lengths (5, 6, 7, 8)
with even, odd, or no parity
Crystal oscillator or external clock input
TTL compatible inputs, outputs
Industrial temperature ranges
48-TQFP and 44-PLCC packages
FIGURE 1. XR16C2450 BLOCK DIAGRAM
A2:A0
D7:D0
IOR#
IOW#
CSA#
CSB#
INTA
INTB
Reset
8-bit Data
Bus
Interface
*5V Tolerant inputs
UART Channel A
UART
Regs
THR
RHR
BRG
Modem I/Os
UART Channel B
(same as Channel A)
Crystal Osc/Buffer
2.97 to 5.5 Volt VCC
TXA
RXA
RTSA#, CTSA#,
DTRA#, DSRA#,
CDA#, RIA#, OP2A#
TXB
RXB
RTSB#, CTSB#,
DTRB#, DSRB#,
CDB#, RIB#, OP2B#
XTAL1
XTAL2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

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